apps/app_nbscat.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Silly application to play an NBScat file -- uses nbscat8k
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * \ingroup applications
  26  */
  27
  28 #include "asterisk.h"
  29
  30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  31
  32 #include <string.h>
  33 #include <stdio.h>
  34 #include <signal.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38 #include <sys/time.h>
  39 #include <sys/socket.h>
  40
  41 #include "asterisk/lock.h"
  42 #include "asterisk/file.h"
  43 #include "asterisk/logger.h"
  44 #include "asterisk/channel.h"
  45 #include "asterisk/frame.h"
  46 #include "asterisk/pbx.h"
  47 #include "asterisk/module.h"
  48 #include "asterisk/translate.h"
  49 #include "asterisk/options.h"
  50
  51 #define LOCAL_NBSCAT "/usr/local/bin/nbscat8k"
  52 #define NBSCAT "/usr/bin/nbscat8k"
  53
  54 #ifndef AF_LOCAL
  55 #define AF_LOCAL AF_UNIX
  56 #endif
  57
  58 static char *app = "NBScat";
  59
  60 static char *synopsis = "Play an NBS local stream";
  61
  62 static char *descrip =
  63 "  NBScat: Executes nbscat to listen to the local NBS stream.\n"
  64 "User can exit by pressing any key\n.";
  65
  66
  67 static int NBScatplay(int fd)
  68 {
  69         int res;
  70         int x;
  71         res = fork();
  72         if (res < 0)
  73                 ast_log(LOG_WARNING, "Fork failed\n");
  74         if (res)
  75                 return res;
  76         if (ast_opt_high_priority)
  77                 ast_set_priority(0);
  78
  79         dup2(fd, STDOUT_FILENO);
  80         for (x=0;x<256;x++) {
  81                 if (x != STDOUT_FILENO)
  82                         close(x);
  83         }
  84         /* Most commonly installed in /usr/local/bin */
  85         execl(NBSCAT, "nbscat8k", "-d", (char *)NULL);
  86         execl(LOCAL_NBSCAT, "nbscat8k", "-d", (char *)NULL);
  87         ast_log(LOG_WARNING, "Execute of nbscat8k failed\n");
  88         return -1;
  89 }
  90
  91 static int timed_read(int fd, void *data, int datalen)
  92 {
  93         int res;
  94         struct pollfd fds[1];
  95         fds[0].fd = fd;
  96         fds[0].events = POLLIN;
  97         res = poll(fds, 1, 2000);
  98         if (res < 1) {
  99                 ast_log(LOG_NOTICE, "Selected timed out/errored out with %d\n", res);
 100                 return -1;
 101         }
 102         return read(fd, data, datalen);
 103
 104 }
 105
 106 static int NBScat_exec(struct ast_channel *chan, void *data)
 107 {
 108         int res=0;
 109         struct ast_module_user *u;
 110         int fds[2];
 111         int ms = -1;
 112         int pid = -1;
 113         int owriteformat;
 114         struct timeval next;
 115         struct ast_frame *f;
 116         struct myframe {
 117                 struct ast_frame f;
 118                 char offset[AST_FRIENDLY_OFFSET];
 119                 short frdata[160];
 120         } myf;
 121
 122         u = ast_module_user_add(chan);
 123
 124         if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds)) {
 125                 ast_log(LOG_WARNING, "Unable to create socketpair\n");
 126                 ast_module_user_remove(u);
 127                 return -1;
 128         }
 129
 130         ast_stopstream(chan);
 131
 132         owriteformat = chan->writeformat;
 133         res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
 134         if (res < 0) {
 135                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 136                 ast_module_user_remove(u);
 137                 return -1;
 138         }
 139
 140         res = NBScatplay(fds[1]);
 141         /* Wait 1000 ms first */
 142         next = ast_tvnow();
 143         next.tv_sec += 1;
 144         if (res >= 0) {
 145                 pid = res;
 146                 /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
 147                    user */
 148                 for (;;) {
 149                         ms = ast_tvdiff_ms(next, ast_tvnow());
 150                         if (ms <= 0) {
 151                                 res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata));
 152                                 if (res > 0) {
 153                                         myf.f.frametype = AST_FRAME_VOICE;
 154                                         myf.f.subclass = AST_FORMAT_SLINEAR;
 155                                         myf.f.datalen = res;
 156                                         myf.f.samples = res / 2;
 157                                         myf.f.mallocd = 0;
 158                                         myf.f.offset = AST_FRIENDLY_OFFSET;
 159                                         myf.f.src = __PRETTY_FUNCTION__;
 160                                         myf.f.delivery.tv_sec = 0;
 161                                         myf.f.delivery.tv_usec = 0;
 162                                         myf.f.data = myf.frdata;
 163                                         if (ast_write(chan, &myf.f) < 0) {
 164                                                 res = -1;
 165                                                 break;
 166                                         }
 167                                 } else {
 168                                         ast_log(LOG_DEBUG, "No more mp3\n");
 169                                         res = 0;
 170                                         break;
 171                                 }
 172                                 next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
 173                         } else {
 174                                 ms = ast_waitfor(chan, ms);
 175                                 if (ms < 0) {
 176                                         ast_log(LOG_DEBUG, "Hangup detected\n");
 177                                         res = -1;
 178                                         break;
 179                                 }
 180                                 if (ms) {
 181                                         f = ast_read(chan);
 182                                         if (!f) {
 183                                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 184                                                 res = -1;
 185                                                 break;
 186                                         }
 187                                         if (f->frametype == AST_FRAME_DTMF) {
 188                                                 ast_log(LOG_DEBUG, "User pressed a key\n");
 189                                                 ast_frfree(f);
 190                                                 res = 0;
 191                                                 break;
 192                                         }
 193                                         ast_frfree(f);
 194                                 }
 195                         }
 196                 }
 197         }
 198         close(fds[0]);
 199         close(fds[1]);
 200
 201         if (pid > -1)
 202                 kill(pid, SIGKILL);
 203         if (!res && owriteformat)
 204                 ast_set_write_format(chan, owriteformat);
 205
 206         ast_module_user_remove(u);
 207
 208         return res;
 209 }
 210
 211 static int unload_module(void)
 212 {
 213         int res;
 214
 215         res = ast_unregister_application(app);
 216
 217         ast_module_user_hangup_all();
 218
 219         return res;
 220 }
 221
 222 static int load_module(void)
 223 {
 224         return ast_register_application(app, NBScat_exec, synopsis, descrip);
 225 }
 226
 227 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Silly NBS Stream Application");